Being in a British punk covers band (and in my mid 50's), I was starting to get hand and arm cramps during gigs as I play finger style.
the revelation came last year when I put a compressor into my board, which meant i didn't need to play so hard to get the same volume/tone (not much dynamics needed in my playing).
Hey presto, I can play faster lines a lot better now, without the aching arm and hand.....works for me!